DESCRIPTION

The functions
getgrent_r()
and
fgetgrent_r()
are the reentrant versions of
getgrent(3)
and
fgetgrent(3).
The former reads the next group entry from the stream initialized by
setgrent(3).
The latter reads the next group entry from
stream.

For more information about the fields of this structure, see
group(5).

The nonreentrant functions return a pointer to static storage,
where this static storage contains further pointers to group
name, password and members.
The reentrant functions described here return all of that in
caller-provided buffers.
First of all there is the buffer
gbuf
that can hold a struct group.
And next the buffer
buf
of size
buflen
that can hold additional strings.
The result of these functions, the struct group read from the stream,
is stored in the provided buffer
*gbuf,
and a pointer to this struct group is returned in
*gbufp.

RETURN VALUE

On success, these functions return 0 and
*gbufp
is a pointer to the struct group.
On error, these functions return an error value and
*gbufp
is NULL.

ERRORS

ENOENT

No more entries.

ERANGE

Insufficient buffer space supplied.
Try again with larger buffer.

CONFORMING TO

These functions are GNU extensions, done in a style resembling
the POSIX version of functions like
getpwnam_r(3).
Other systems use the prototype

SEE ALSO

COLOPHON

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